This supplement [Ann Emerg Med 2008;51(3 Suppl 1):S1-S38] represents the first supplement to Annals of Emergency Medicine in nearly 16 years! These consensus documents on the evaluation and management of hypertension and hypertensive emergencies in the ED was systematically developed between December 2006 and April 2007 in an evidence-based and consensus-based process and culminated in the March 2008 supplement of Annals. This consensus document on the evaluation and management of hypertension and hypertensive emergencies in the ED was systematically developed between December 2006 and April 2007 in an evidence-based and consensus-based process. The panel members were selected from a multidisciplinary group of specialists, which included physicians from emergency medicine, neurology, neurological surgery, internal medicine, hospital medicine, nephrology, cardiology, pediatrics, anesthesiology, vascular surgery, and gynecology and obstetrics. Each specific hypertension section or topic was assigned at least 2 experts, one of whom was usually an emergency physician.